NATURAL OEDEE?- 281 



pendulous. Drupe bacca!^e. Seed solitary; embryo large in 

 sparing albumen. 



Genus.— IS'yssa. 



512. LoRANTHACE^, the MistUtoe Tribe. — Shrubsy usually 

 parasitical. Leaves opposite, coriaceous, entire. Flowers dioe- 

 cious. Sejpals 4-8, distinct or united. Stamens as many as the 

 sepals, and opposite them. Ovary 1-celled ; ovules with a 

 naked nucleus. Fruit a berry, 1-celled. Seed solitary ; em- 

 hryo small in the axis of fleshy albumen. 



a. Properties : the berries contain a viscid matter like bird-lime ; the bark is 

 astringent. 



Genus. — Viscum, 



513. IJLMACEiE, the Elm Tribe. — Trees or shriibs. Leaves 

 alternate, rough, stipules .deciduous. Flowers in loose clusters. 

 Calyx campanulate, 4 or 5 cleft, irregular, imbricated in gesti- 

 vation. Stamens definite, inserted into the base of the calyx. 

 Ovary 1 or 2 celled ; ovule solitary, pendulous. Fruit a samara 

 or drupe. Seed with little or no albumen ; embryo straight or 

 curved. 



Genera. — Celtis, Ulmus, Planera. 



514. Saueuracej3, the Lizard-tail Tribe. — Herbs growing in 

 marshy places. Leaves alternate, entire, stipulate. Flowers 

 growing in spikes, destitute of floral envelopes. Stamens defi- 

 nite. Ovary consisting of from 3 to 5 more or less united car- 

 pels. Fruit a capsule or berry. Seeds 1 in each cell ; embryo 

 minute, lying in the persistent embryo-sac at the base of the 

 albumen. 



Genus. — Saururus. 



515. PiPERACEiE, the Pepper Tribe. — Shrubs or herbs ^ with 

 articulated stems. Leaves opposite or verticillate. Flowers 

 spiked or racemose. Stamens 2 or more, arranged on one side, 

 or round the ovary. Ovary simple, 1-celled; ovule solitary, 

 erect. Fruit a berry. Seed erect ; embryo lying in a fleshy 

 sac outside the albumen at the apex of the seed. 



a. Properties : pungent, aromatic, stimulant. 

 Genus. — Piper. 



516. Ceratophyllacej]:, the ILornwort Tribe. — Aquatic herbs. 

 Leaves verticillate, cut into filiform lobes. Flowers mono3cious. 

 Calyx many-parted. Stamens indefinite; anthers sessile, 2- 

 celled. Omryfvee^ 1-celled ; ovide solitary, pendulous ; stir/ma 

 filiform. Fruit a 1-celled nut, terminated by the hardened 

 stigma. Seed exalbuminous ; cotyledons 2 (appaiently 4), with 

 a manifest plumule. 



Genus. — Ceratophyllura. 



